Chunk #19 — Materials and Methods — Statistical Analysis — Analysis of the GADD sample

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Examination of genetic variation in GABRA2 with conduct disorder and alcohol abuse and dependence in a longitudinal study.

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As in the CADD, CD was assessed in adolescents using the DISC and in subjects over 18 using the DIS. All study participants were evaluated using DSM IV diagnoses. DSM IV defined AAD were assessed with the CIDI-SAM. Subjects with comorbid drug use were not excluded. Each variable was standardized and analyzed as described below.